Electric blinker



Sept. 6, 1932. UDW|G 1,875,625

ELECTRIC BLINKER Filed May 13, 1929 vweutoz auf; L U o w/'g Patented Sept. 6, 1932 f 'ras UNITED STA murs LUDWIG, or NEW Yom:

A ELECTRIC Application led lay 13,

The invention relates toblinkers for interrupting an electric current so that any electric lamp lit by the current will be caused to blink, or to be alternately switched on and off. The invention resides in the novely construction whereby the device may bey connected on one of the wires in the circuit, and in the novel and compact arrangement and assembling of the various parts constituting the device. The object of the invention is to provide a blinker of simple, compact and inexpensive construction, which can conveniently be connected in any circuit and which will function with accuracy.

These and other objects and advantages will be readily understood'from the following description and from the accompanying drawing of a preferred embodimentof which Fig. 1 is a cross-sectional side view,

Fig. 2 a top view,

Fig. 3 another top view ywith part of the casing removed, f

Fig. 4 a cross-sectional side view of a modiication,

Fig. 5 an enlarged view of the end of the casing, and

Fig. 6 another enlarged view ofthe end of the casingshowing a modification.

Referring rst to Figs. 1, 2 and 3, the blinker consists of a lower casing 10 and an upper casing 11. These parts are made of insulating material and are provided withlugs 12,

13, 14 and 15 at their ends. A yrectangular f recess 16 isformed within the casings and these are held together by eyelets 17 and 18.

A thermostatic switch is located in the re'- cess 16 and consists yof a strip ofinsulating material 19 on which is mounted, by means of an eyelet 20 and a screw and nut 21 and 22, a strip of thermostatic metal 23. A contact point 24 is riveted in one end of the strip 23 and aligns with a contact point 25 which is mounted in the end of the adjusting screw 26. This screw is secured on thefinsulating strip 19.

A metal, connecting link 27 is secured rto one end of the insulating strip by means of k the adjusting screw and a similar link 28 is secured to the other end by means of the eyelet 20. These links are clamped betweenr Bamm 15de-.f- Mseran :n.acasss.

thelugs 12, 13,14 and' 15 when eyelets y17 and 18 areA riveted and thus rigidly support the: thermostatc switch. M

A pieceof asbestos 29 is Wrapped 'around the thermostatic metal strip and upon this is wound a resistance coil 30, one end ofwhich is connected to the link 27 and the other end tothe link 28. The construction of the switch is such that under normal temperature the Contact points 24 and 25 are disconnected.y e,k

When the current is first turned on` it passes y through the link 28, resistance coil30. and lmk 27, until, from the heat given up by coil, the thermostatic strip kcurves and the points 24 and 25 contact. After which 65 the currentiiows through link 28,` thermostatic strip 23, adjusting'screw 26 and link 27. v After thestrip cools the contactpoints l disengage' and the current again flows through `the ristancecoil. The timing of these alternations may be altered by adjusting the screw 26. n

Asalread explained, the links 27 and 28 are secured tween the lugs of the casings hyy means of the eyelets 17 and v18. The links 75 are in electric contact with the e elets and theeyelets are internally threade Screws 31 and 32 engage in the eyelets and the upper casing is `cofunterbored so as not to expose the heads vof these screws. The blinker `is connected in they circuit by meansy of these( sews,as plainly shown by the wires 33 and It will be seen ythat with the construction as just explainedthe switch may be fully assembled, tested and adjusted before beingV sealed in the casings. kThe modificationin Fi u 4 .diiit'ers somewhat in its construction. n he Casin sand the method ofassembling' these are tdi lating strip Aand the adjusting screw arek omitted. In this Case the thermostatic metal strip 35 is clamped between one end of the casings and a metal link 36 between the other end. It operatessimilar to the blinker 95 first described. While it is stated that the casings l10 and 11 are constructed of insulating material, it will be readily understood that these parts may be constructed of metal and properly insulated from the switch 100 e same, but the insuv.-l

mechanism as shown in Fig. 6. In this case insulating bushings 37 and 38, having shoulders 39 and 40 respectively, insulate the eyelet from the half casings, while insulating washers 4l and 42 insulate the part 27. The hole in part 27 iits the eyelet tightly.

Having described my invention, what I claim as new and wish to protect by Letters Patent is:

l. An electric blinker connectable to a;`

single wire of an electric circuit consisting of, a casing formed of two halves, a thermostatic switch contained in said casing and in! sulated therefrom, the terminals of said switch supported between the ends of the hal-casings and electrically connected with the means by which these are assembled, and said assembling means consisting of eyelets which form the terminals by which the device is connected in an electric circuit.

2. An electric blinker connectable to a single wire of an electric circuit consisting of, a casing made of insulating material and formed of two halves, a thermostatic switch contained in said casing, the terminals Vof said switch supported between the ends of the half-casings and directly connected with the metal 'fasteners by which these are assembled, and said metal fasteners consisting of eyelets which form the terminals by which the device is connected to a wire. y

3. An electric blinker adapted to be connected to a single wire of an electric circuit and consisting of, a casing made of insulating material and formed of two halves, an

adjustable thermostatic switch contained in said casing, the terminals of said switch supported between the ends of the half-casings and electrically connected with the means by which these are assembled, and said assembling means consisting of eyelets which form the terminals whereby the device is connected in an electric circuit.

,4. An electric blinker adapted to be connected to a single wire of an electric circuit and consisting of, a casing made of insulating material and formed of two halves, a.v

thermostatic switch contained in said casing, the terminals of said switch supported between tlie ends of the hal-casings and electrically connected with the means by which these are assembled, and said assembling means consisting of internally threaded eyelets which in connection with screws inserted therein form binding posts for connecting the device in an electric circuit.

LOUIS LUDWIG. 

